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首页> 外文期刊>Physical review, C >Precise beta branching-ratio measurement for the 0(+) -> 0(+) superallowed decay of Ar-34
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Precise beta branching-ratio measurement for the 0(+) -> 0(+) superallowed decay of Ar-34

机译：精确的β分支比测量为0（+） - > 0（+）AR-34的超级衰减

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摘要

We have measured the branching ratio for the superallowed 0(+) -> 0(+) beta transition from Ar-34 to be 0.9448(8), and determined its f t value to be 3058.1(28) s, a result with +/- 0.09% precision, which is a factor of 3 improvement over the previous result based on current world data. The f t-value ratio for the mirror pair of superallowed transitions Ar-34 -> Cl-34 and Cl-34 -> S-34 becomes the most precise yet measured and, in a sensitive test of the method used to calculate the isospin-symmetry-breaking correction, delta(C), it agrees well with the ratio as calculated with Woods-Saxon radial wave functions. This confirms the method used in the most recent survey of superallowed decays to extract Vud, the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix. In addition, our branching-ratio results for the four observed Gamow-Teller branches to 1(+) states in Cl-34 are shown to agree well with shell-model calculations based on the same effective interactions that were used in the determination of delta(C).
机译：我们已经测量了从AR-34到0.9448（8）的超级0（+） - > 0（+）β转变的分支比，并确定其FT值为3058.1（28）S，结果与+ / - 0.09％的精确度，基于当前世界数据的先前结果，这是3倍。镜子对超级过渡AR-34 - > Cl-34和Cl-34 - > S-34的F T值比变为最精确的测量，并且在用于计算ISOSPIN的方法的敏感性测试中-symmetry破校正，δ-（C），它与所述一致比率以及与伍兹撒克逊计算的径向波函数。这证实了在最近对超级衰减的最新调查中使用的方法，以提取VUD，Cabibbo-Kobayashi-Maskawa基质的上下夸克混合元件。此外，我们在CL-34中的四个观察到的Gamow-Teller分支到1（+）态的分支比率结果与基于相同的有效相互作用的壳模型计算吻合良好，这些分析均相同（C）。

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